<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="css/bootstrap.css">
    <link rel="stylesheet" href="css/men.css">
    <script src="./js/jquery-3.3.1.min.js"></script>
    <script src="./js/bootstrap.min.js"></script>
</head>
<body>
    <header class="container-fluid">
        <!-- bs3-navbar:fixed-top 一键生成 -->
        <nav class="navbar navbar-default navbar-fixed-top">
            <div class="container">
              <div class="navbar-header">
                     <span class="glyphicon glyphicon-search navbar-brand"></span>
                     <input type="text"  placeholder="请输入内容" class="glyphicon" style="margin-top:12px;">
              </div> 
          
              <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
                <ul class="nav navbar-nav navbar-right">
                    <li><a href="#">欢迎来到管理后台</a></li>
                    <li><a href="#"><span class="glyphicon glyphicon-user"></span></a></li>
                    <li><a href="#"><span class="glyphicon glyphicon-envelope"></span></a></li>
                    <li><img src="./images/a.png"class="img-circle"></li>
                    <li><a href="#">注销</li>
              </div>
            </div>
          </nav>
    </header>
</body>
</html>